Grinding-machine.



A. FL ROCKWELL.

GRINDING MACHINE.

APPLICATION man 0616, 1910.

-, 11 5 INVENTOR wmwss sas fllert P3005210? Patefited Mar. 21, 1916 v l .1: NncTIc T;

aacitiien ofthe United States, residing at nec'ticut, have nvented; a certain new and useful Grinding-lllachine, of which the folsuch aSJYlll enable others skilled inthe art to vhichflitappertains}to make and use the same,reference beinglhadto the tlCCOlIlPaDY- ingdrawings,gforming"part of this specificationbi f 1 w v e I )My invention relates topgrinding machines, and is.particularly applicable to those machinesdforgrinding balls in which the balls traverse]aiserijes. of grinding grooves which are connected by transfer grooves. Heretoforeit 113$JlJEQIIiCLIStOIIIHI'y to pro- .support ed stationajryl guide disk and a "cooperative,j rotativeabraslve disk, said disks havingwa concentric; series of. niatclung groovesintvhichthelballs are received and grcund' thet.isaidtguide diskalso having transfer. s grooves, each of which extends across the line ofa iribyoffthe abrasive disk next, uvher'eby each ball takes: an orderly course I through all of? the, said :concentric grindingxgrooves andfltraverses the; same path traversed by[eachother1 ball, thus se curing uniformity of product. In such ma clrinesit hasbeencustomary*to provide the saidguide diski1(or,its transfer. plate) with y fingers on'likedeflectors whichobstruct the said.grihding grooves and carry the balls into Hth transfer grooves? whereby durin g tion of the lengtliof "each transfer groove 4 ba ll'is wholly butjdtcontrotof and out of contactavith the said abrasive disk.

chinespprovide fOI SmOOtllCI'IH"(l more even a travel of, the (balls through the machine, provid e for" increased grii ding action, and

secure continuityfof, the grinding action.

Tojiithejse ends, and also to improve generm'yfi'nventionconsists mu various matters hereinafter descrlled {and cla med.

r lathe accompanying dra ving Figure 11s face; l'eW of the gmdedisk olsuch a ma- Q GRINDING-MACHINE.

Specification of Letters Patent. Application filed October 6, 1910. Serial No. 585,592. I

Bristol county ofi Hartford, State of (lnowingi is a full, clear, and; exact description,

videball grinding,machineswith a suitably and connects one grindinggroove with the either the whojle for some considerable por.

ticularly in Figs. 3, 4 and 5.

Myobject is to reduce the costofsuch maall'yiupondeyices of thecharacter indicated,

chine-,the position of tlie jedgesot the cooper disk;beingindicatcdbybroken,

[lTEDi STATES PATENT OFFICE.-

nook'in enflomanls'ron corimzo'rxcn'r, ASSIGNOB To THElNEW DEPARTURE v menurec'runtnejoomneny, or BRISTOL, coNNEcmcUg-n oonmamron OF con. i

Patented Mar. 21, 1916.

lines; Fig. 2 is an enlarged detail of a portion of the said guide disk and its transfer plate, the positions of the ribs of the cooperating abrasive diskb'eing indicated by broken lines; Fig.3 is a fragn'lentary sec-.

tional elevation through the guide disk and abrasive disk on ab0.ut, the line 3-3 of Fig. 2; and ligsie and are fragmentary elevations of such disks on about the lines and 5 5, respectively, of Fig. 2;

In the illustrated en'ibodin'ient of my invention, 1 indicates the guide disk and 2 the abrasive disk, said guide disk'having the concentric grooves 3 and the abrasive disk having the crziiperatingand matching con centric grooves 4 for receiving and grinding the balls. Said guide disk also has the 7 transfer grooves 5 which connect \vl1at may be termed the delivery end of one said concentric groove, such asst; (Fig. 2), with what may be termed the receiving end of the next,

such as 7, a transfer groove thus extending across the line of a rib, such as S, of the abrasive disk and having its middle portion 9 deeper than its entrance and exitpoints to pe'rn'iit balls to pass under such rib 8, the' middle portion 9 being connected to such entrance and exit points by the inclined p0rtlons 10 and 11. The transfer grooves are usually formed in a detachable transfer plate 12. 'l he entrance opening 13 and the exit opening 14 permit the admission anddischarge of balls.

According to my invention the depth of the transfer groove is such that throughout its length the distance from its bottom to the opposing portion of the face of the abrasive disk is apl'n'oxnnately that of the dian'ieter,

of the ball being acted upon, as shown par- Thus, even while traversing a transfer groove, the ball is confined between the cooperating disks 1 and 2 and by these elements themselves, the necessity for deflecting fingers and the like being thereby avoidedm l urthermore, the distance between the line of said transfer groove UPOHflVl'llCh the balltracks'and the said opposingportion of the face of the abrasive disk is preferab y such that the ball is in grinding contact-with the said abrasive disk even while traversing the transfer groove, whereby not only do the two disks themselves serve to confine the ball butthe.

ball is ground during the whole of the transits: cutaway to inelinethe side of aid rib away from the n rmal'track of rticles; substantially as described.

e disk provided} with a rib, of a coopertlng guide disk having a transfer groove endingacrloss, the line of saidrib, said ransferhgroove bein gi open throughout its at {of the: articles acted upon substantially sgdescribedfl 1 jlaIThe com ive disk provided with a rib, ;of a cooper- Xtendingwaerossfthe n line ofsaid rib, said er; groove beingwiderthjan the article acted on; substantially as described. :5; The combination with a grooved abraivefdisk provided with airib,of. a coopertingt guide disk having a transfer groove Xtending across ,thepline fof said rib, said ra nsfer groove being openthroughout its engthat its portion facing said" abrasive isk having its bottom throughout its ength'spaced from the opposingface of said abrasive disk a distance approximately that tofiithe diameter a of the articles imted upon; ,substantially as; described.

ting gtiidefdiskflhaving afi transfer groove Xtenthngacross, the linefof said rib, said the 3 The combination with a grooved abraength andfibeingjof a width greater thangrooved abrat ng guide "disk havingia transfer groove ib havingitsjedgecut-away, and said trans- 6,} The combination with grooved abraprovldedfwith a rib, of a coopertransfer groove being open throughout its length at its portion-facing said abrasive disk and having its bottom throughout its length spaced fromthe opposing face of said abrasive disk a distance substantially that of the diameter of the articles acted upon, whereby said articles may be in grinding contact with said abrasive disk throughout their transit through said transfer groove; substantially as described. f

7. In a device for grinding articles, the combination with'a grooved abrasive disk provided with a rib, of a cooperating guide disk having a transfer groove extending across the line ofsaid rib, said rib having its edge cutaway to incline the side of said rib away from the normal track of the article; substantially as described. a

8. A grooved grinding diskwith its groove including a transfer-portion, suchi groove being open throughout its length and having portions of a Width substantially equal to the diameter of the article acted upon, the transfer-portion of said groove having a substantially greater width crosswise of said groove than said first-named portions; substantially as described.

In testimony whereof, I hereunto afiix my signature, in the presence of two witnesses. v

ALBERT F. ROCKWELL. Witnesses:

CHARLES S. JOY,

HARRY W. TUTTLE. 

